doc_markdown should ignore things which just contain acronyms

描述

贡献者指南

技术栈

rust

领域

toolingdeveloper experience

议题类型

feature

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

3

预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。

1-3 hours

活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。

fresh

清晰度议题是否清楚说明期望改动、验收标准和下一步。

mostly clear

前置要求

Rust basicsclippy architecturelint implementation

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

60

研究方向

The issue requires modifying the doc markdown lint in clippy to ignore strings that are acronyms (e.g., DirectX, OpenGL). The logic should treat such strings as not requiring backticks. The implementation should be in the lint's code, likely in `clippy lints/src/doc.rs`. There is a comment suggesting to check if a word is all caps with a single lowercase letter at the end? Actually the issue says for camel case it should have at least two camelcase words each with at least one lowercase letter. So the fix is to adjust the camel case detection to exclude strings that are just acronyms (all caps or with a lowercase ending?). The contributor should explore the existing doc markdown implementation and add a condition to skip words that consist only of uppercase letters or have a single trailing lowercase letter (like DirectX). Look at existing tests in `tests/ui/doc.rs` for reference.